SEAGATE (ST8000VX004) - Инструкция по эксплуатации - Страница 27

Seagate SkyHawk  Serial ATA Product Manual, Rev. B

  26

4.3.1

Identify Device command

The Identify Device command (command code EC

H

) transfers information about the drive to the host following power up. The data is 

organized as a single 512-byte block of data, whose contents are shown in 

Table 8 on page 24

. All reserved bits or words should be

set to zero. Parameters listed with an “x” are drive-specific or vary with the state of the drive. 

See Section 2.0 on page 6 

for default 

parameter settings.

The following commands contain drive-specific features that may not be included in the Serial ATA specification.

Word

Description

Value

0

Configuration information:

• Bit 15: 0 = ATA; 1 = ATAPI

• Bit 7: removable media

• Bit 6: removable controller

• Bit 0: reserved

0C5A

H

1

Number of logical cylinders

16,383

2

ATA-reserved

0000

H

3

Number of logical heads

16

4

Retired

0000

H

5

Retired

0000

H

6

Number of logical sectors per logical track: 63

003F

H

7–9

Retired

0000

H

10–19

Serial number: (20 ASCII characters, 0000

H

 = none)

ASCII

20-21

Retired

0000

H

22

Obsolete

0000

H

23–26

Firmware revision (8 ASCII character string, padded with blanks to end of string)

x.xx

27–46

Drive model number: (40 ASCII characters, padded with blanks to end of string)

47

(Bits 7–0) Maximum sectors per interrupt on Read multiple and Write multiple (16)

8010

H

48

Trusted computing feature set options

4000

H

49

Standard Standby timer, IORDY supported and may be disabled

2F00

H

50

ATA-reserved

0000

H

51

PIO data-transfer cycle  timing mode

0200

H

52

Retired

0200

H

53

Words 54–58, 64–70 and 88 are valid

0007

H

54-58

Obsolete

xxxx

H

59

Number of sectors transferred during a Read Multiple or Write Multiple command

xxxx

H

60–61

Total number of user-addressable LBA sectors available

(see 

Section 2.2

 for related information)

*Note: The maximum value allowed in this field is: 0FFFFFFFh (268,435,455 sectors, 
137GB). Drives with capacities over 137GB will have 0FFFFFFFh in this field and the actual 
number of user-addressable LBAs specified in words 100-103. This is required for drives 
that support the 48-bit addressing feature.

0FFFFFFFh*

62

Retired

0000

H

63

Multiword DMA active and modes supported (see note following this table)

x4

07

H

64

Advanced PIO modes supported (modes 3 and 4 supported)

0003

H

65

Minimum multiword DMA transfer cycle time per word (120 ns)

0078

H

66

Recommended multiword DMA transfer cycle time per word (120 ns)

0078

H

67

Minimum PIO cycle time without IORDY flow control (120 ns)

0078

H